WO2005056285A1 - Sandwich panel core - Google Patents

Sandwich panel core Download PDF

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Publication number
WO2005056285A1
WO2005056285A1 PCT/RU2003/000552 RU0300552W WO2005056285A1 WO 2005056285 A1 WO2005056285 A1 WO 2005056285A1 RU 0300552 W RU0300552 W RU 0300552W WO 2005056285 A1 WO2005056285 A1 WO 2005056285A1
Authority
WO
WIPO (PCT)
Prior art keywords
binder
core
holes
paper
base
Prior art date
Application number
PCT/RU2003/000552
Other languages
French (fr)
Inventor
Niaz Irekovich Akishev
Ildus Muhametgaleevich Zakirov
Alexandr Vladimirovich Nikitin
Original Assignee
Airbus
Otkrytoe Aktsionernoe Obschestvo 'kazansky Nauchno-Isledovatelsky Institut Aviatsionnoi Tekhnologii'
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Airbus, Otkrytoe Aktsionernoe Obschestvo 'kazansky Nauchno-Isledovatelsky Institut Aviatsionnoi Tekhnologii' filed Critical Airbus
Priority to US10/582,228 priority Critical patent/US7771813B2/en
Priority to EP03815806A priority patent/EP1691974A1/en
Priority to CA2546728A priority patent/CA2546728C/en
Priority to AU2003303854A priority patent/AU2003303854A1/en
Priority to JP2005511703A priority patent/JP2007528805A/en
Priority to PCT/RU2003/000552 priority patent/WO2005056285A1/en
Priority to CN200380110774XA priority patent/CN1878663B/en
Publication of WO2005056285A1 publication Critical patent/WO2005056285A1/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
    • E04C2/32—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure formed of corrugated or otherwise indented sheet-like material; composed of such layers with or without layers of flat sheet-like material
    • E04C2/326—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure formed of corrugated or otherwise indented sheet-like material; composed of such layers with or without layers of flat sheet-like material with corrugations, incisions or reliefs in more than one direction of the element
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24149—Honeycomb-like
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
    • Y10T428/24322—Composite web or sheet
    • Y10T428/24331—Composite web or sheet including nonapertured component
    • Y10T428/24339—Keyed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
    • Y10T428/24322—Composite web or sheet
    • Y10T428/24331—Composite web or sheet including nonapertured component
    • Y10T428/24339—Keyed
    • Y10T428/24347—From both sides
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24628—Nonplanar uniform thickness material
    • Y10T428/24661—Forming, or cooperating to form cells

Definitions

  • Our invention can be defined in its most general form as a 3-D light core from sheet material, especially from polymeric "NOMEX” paper, and can be used in production of sandwich panels as applied to aircraft production, construction and other branches of industry.
  • a folded core made from synthetic fabric (glass fabric, carbon fabric, etc.) with applied onto the parts forming core lateral ridges and hot-pressed binder (RF Patent no. 2,057,647 Cl . Method for production of core from composite material. - Int. Cl: B 29 D 9/00. - Bulletin no. 10 of 10.04.96).
  • the main short-coming of herein-presented core is its labor-consuming production and the necessity of sophisticated equipment for discrete impregnation of fabric.
  • a sandwich panel core made from sheet polymeric material, e.g. from "Phenylone" polyamide paper, impregnated from its both sides (with binder) (V. I.
  • Our invention has for its object to increase the mechanical properties of light core from sheet materials owing to base-binder bonding strength hardening and decrease of the applied binder mass.
  • the technical result attained at executing of the claimed invention is an increase of aircraft efficiency owing to improvement of sandwich panels unit weight properties used in airframe.
  • the stated technical result is attained by that the sandwich panel core being a 3-D structure, especially from polymeric paper with binder applied onto its both sides, includes the paper base perforated, e.g.
  • n h whereof the quantity of the holes and their diameter satisfy the condition n h , where n n is the quantity of holes, d h is the diameter of holes, ⁇ b is the binder layer thickness decrease as compared to the prototype, F is the core surface area, ⁇ p is the base layer thickness, p is the paper base material density, p b is the binder density.
  • Fig. 1 is a general view sandwich panel folded core
  • Fig. 2 shows the core blank plane sheet
  • Fig. 3 is a blank fragment with perforation
  • Fig. 4 is a sectional view A- A of Fig. 3.
  • the figures 1-4 present the following positions: 1 is the ready-made core, 2 is the perforated blank, 3 are the through-holes in the blank material, 4 is the core base material (polymeric "NOMEX" paper), 5 is the binder layer.
  • Sandwich panel core is a 3-D structure 1 formed by blank 2, e.g. from polymeric "NOMEX” paper, folded in a peculiar manner owing to bending along the marking-out lines.
  • the blank 2 has on its both sides a coating formed by binder layers 5 on the basis of, e.g. phenol-formaldehyde resin, applied onto the paper surface in its liquid state and thermally hardened.
  • binder layers 5 on the basis of, e.g. phenol-formaldehyde resin, applied onto the paper surface in its liquid state and thermally hardened.
  • the polymeric paper has a relatively low adhesion to phenolic binders
  • the blank 2 of the core 1 is perforated before binder application and shaping wherewith the binder layers bond in-between at locations of the holes 3 therefore forming 3-D structure working as a single whole in the core structure. It allows to increase the strength and rigidity of the core structure, or to decrease the total thickness of binder layers under the strength given, and, therefore, to decrease its mass

Abstract

The invention can be defined in its most general form as a 3-D light core from sheet material, especially from 'NOMEX' polymeric paper, and can be used in production of sandwich panels as applied in aircraft production, construction and other branches of industry.With the aim to improve the core mechanical and unit weight properties, the paper base is perforated thereby increasing the base-binder bonding strength, whereof the binder is applied onto both sides of the base to increase its structure rigidity, owing to bonding of binder layers in-between at the locations of the holes. The quantity of the holes and their diameter are defined in a formula.

Description

SANDWICH PANEL CORE
Technical Field
Our invention can be defined in its most general form as a 3-D light core from sheet material, especially from polymeric "NOMEX" paper, and can be used in production of sandwich panels as applied to aircraft production, construction and other branches of industry.
Background Art
Known is a folded core made from synthetic fabric (glass fabric, carbon fabric, etc.) with applied onto the parts forming core lateral ridges and hot-pressed binder (RF Patent no. 2,057,647 Cl . Method for production of core from composite material. - Int. Cl: B 29 D 9/00. - Bulletin no. 10 of 10.04.96). The main short-coming of herein-presented core is its labor-consuming production and the necessity of sophisticated equipment for discrete impregnation of fabric. Known is a sandwich panel core made from sheet polymeric material, e.g. from "Phenylone" polyamide paper, impregnated from its both sides (with binder) (V. I. Khaliulin, Technological schemes for sandwich structures production, KSTU, Kazan, 1999. - 168 p., p. 40-44. - ISBN 5-7579-0295-7). The main short-coming of herein-presented core is the weighting of panel structure due to increasing of the applied binder (having relatively high density) mass up to that of comparable with the paper base mass to provide the core mechanical properties required. Disclosure of Invention
Our invention has for its object to increase the mechanical properties of light core from sheet materials owing to base-binder bonding strength hardening and decrease of the applied binder mass. The technical result attained at executing of the claimed invention is an increase of aircraft efficiency owing to improvement of sandwich panels unit weight properties used in airframe. The stated technical result is attained by that the sandwich panel core being a 3-D structure, especially from polymeric paper with binder applied onto its both sides, includes the paper base perforated, e.g. with the use of multi-beam laser, whereof the quantity of the holes and their diameter satisfy the condition nh , where
Figure imgf000004_0001
nn is the quantity of holes, dh is the diameter of holes, Δb is the binder layer thickness decrease as compared to the prototype, F is the core surface area, δp is the base layer thickness, p is the paper base material density, pb is the binder density. The undertaken by the applicant state of the art analysis shows that there are no analogs characterized by the combination of the features identical to those of the invention. Therefore, the claimed technical solution satisfies the "novelty" condition of patentability. The results of retrieval for the known solutions in the given area with the aim to reveal the features identical with distinctions of the claimed technical solution show that its features do not result from the state of the art. From the defined state of the art the applicant managed to reveal no influence of the specified essential features upon the attainment of the stated technical result. The claimed technology, therefore, satisfies the "inventive step" condition of patentability.
Brief Description of Drawings
The figures 1-4 present the essence of the invention: Fig. 1 is a general view sandwich panel folded core; Fig. 2 shows the core blank plane sheet; Fig. 3 is a blank fragment with perforation; Fig. 4 is a sectional view A- A of Fig. 3. The figures 1-4 present the following positions: 1 is the ready-made core, 2 is the perforated blank, 3 are the through-holes in the blank material, 4 is the core base material (polymeric "NOMEX" paper), 5 is the binder layer.
Best Mode for Carrying Out the Invention
Sandwich panel core is a 3-D structure 1 formed by blank 2, e.g. from polymeric "NOMEX" paper, folded in a peculiar manner owing to bending along the marking-out lines. With the aim to increase the structure strength, the blank 2 has on its both sides a coating formed by binder layers 5 on the basis of, e.g. phenol-formaldehyde resin, applied onto the paper surface in its liquid state and thermally hardened. Since the polymeric paper has a relatively low adhesion to phenolic binders, the blank 2 of the core 1 is perforated before binder application and shaping wherewith the binder layers bond in-between at locations of the holes 3 therefore forming 3-D structure working as a single whole in the core structure. It allows to increase the strength and rigidity of the core structure, or to decrease the total thickness of binder layers under the strength given, and, therefore, to decrease its mass; finally, it allows to improve the unit weight properties of sandwich panels, used in airframes, with the core given.
Industrial Applicability
The economic effect of the claimed technical solution is obtained at decrease of the binder layers total thickness 3 providing the decrease of layers quantity, the reduction of power inputs for layer-by-layer hardening of the applied binder, and therefore the extension of the core production outputs.

Claims

Claim Sandwich panel core being a 3-D structure from polymeric paper with binder applied onto its both sides is characterized by that it includes the perforated paper base whereof the binder layers thickness is decreased whereas the decrease value, the quantity of the perforated holes and their diameter satisfy the condition nh where
Figure imgf000007_0001
nh is the quantity of holes, dh is the diameter of holes, Δb is the binder layer thickness decrease, F is the core surface area, δp is the base layer thickness, ρp is the paper base material density, p0 is the binder density.
PCT/RU2003/000552 2003-12-11 2003-12-11 Sandwich panel core WO2005056285A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US10/582,228 US7771813B2 (en) 2003-12-11 2003-12-11 Sandwich panel core
EP03815806A EP1691974A1 (en) 2003-12-11 2003-12-11 Sandwich panel core
CA2546728A CA2546728C (en) 2003-12-11 2003-12-11 Sandwich panel core
AU2003303854A AU2003303854A1 (en) 2003-12-11 2003-12-11 Sandwich panel core
JP2005511703A JP2007528805A (en) 2003-12-11 2003-12-11 Sandwich panel core
PCT/RU2003/000552 WO2005056285A1 (en) 2003-12-11 2003-12-11 Sandwich panel core
CN200380110774XA CN1878663B (en) 2003-12-11 2003-12-11 Sandwich panel core

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/RU2003/000552 WO2005056285A1 (en) 2003-12-11 2003-12-11 Sandwich panel core

Publications (1)

Publication Number Publication Date
WO2005056285A1 true WO2005056285A1 (en) 2005-06-23

Family

ID=34676070

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/RU2003/000552 WO2005056285A1 (en) 2003-12-11 2003-12-11 Sandwich panel core

Country Status (7)

Country Link
US (1) US7771813B2 (en)
EP (1) EP1691974A1 (en)
JP (1) JP2007528805A (en)
CN (1) CN1878663B (en)
AU (1) AU2003303854A1 (en)
CA (1) CA2546728C (en)
WO (1) WO2005056285A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9050784B2 (en) 2010-12-22 2015-06-09 E I Du Pont De Nemours And Company Fire resistant back-sheet for photovoltaic module
DE102014117078A1 (en) 2014-11-21 2016-05-25 Technische Universität Dresden Multilayer folding core

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8043688B2 (en) * 2008-11-25 2011-10-25 Sabic Innovative Plastics Ip B.V. Multiwall sheet, an article, a method of making a multiwall sheet
WO2017221105A1 (en) 2016-06-23 2017-12-28 Manoj Harilal Akkad Method for enhancing resistance to delamination of a coating layer applied to a rigid, monolithic substrate
CN110561875A (en) * 2019-08-19 2019-12-13 瑞安市锦祥无纺布有限公司 environment-friendly waterproof non-woven fabric and production process thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4150186A (en) * 1976-07-21 1979-04-17 Nissan Motor Company, Limited Composite board structure and a method of and an apparatus for producing the board structure
US4647063A (en) * 1982-11-22 1987-03-03 Fischer Gesellschaft M.B.H. Lightweight core for laminate constructions

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US3767498A (en) * 1970-10-16 1973-10-23 Martin Marietta Corp Method of making capillary insulation panels
CA1278502C (en) * 1987-03-13 1991-01-02 Eric P. Stern Reducing shrinkage of phenolic foam composites
RU2057647C1 (en) 1991-07-30 1996-04-10 Казанский Авиационный Институт Им.А.Н.Туполева Composition material filler production method
JPH0560831U (en) * 1992-01-28 1993-08-10 慶治 幸田 Sandwich plate
CN1109599C (en) * 1999-07-09 2003-05-28 陆向勤 Once folding process to form honeycomb paper core
US6546694B2 (en) * 2001-04-24 2003-04-15 Dofasco Inc. Light-weight structural panel
US6815022B2 (en) * 2002-06-18 2004-11-09 Sonoco Development, Inc. Laminated structures constructed from adhesively joined sheet material layers
GB0310980D0 (en) * 2003-05-13 2003-06-18 Glaxo Group Ltd Novel compounds
ATE392307T1 (en) * 2003-12-17 2008-05-15 Airbus Sas SANDWICH PLATE

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4150186A (en) * 1976-07-21 1979-04-17 Nissan Motor Company, Limited Composite board structure and a method of and an apparatus for producing the board structure
US4647063A (en) * 1982-11-22 1987-03-03 Fischer Gesellschaft M.B.H. Lightweight core for laminate constructions

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9050784B2 (en) 2010-12-22 2015-06-09 E I Du Pont De Nemours And Company Fire resistant back-sheet for photovoltaic module
DE102014117078A1 (en) 2014-11-21 2016-05-25 Technische Universität Dresden Multilayer folding core
DE102014117078B4 (en) 2014-11-21 2022-02-03 Technische Universität Dresden Folded core for a sandwich structure, method for producing a folded core and sandwich structure

Also Published As

Publication number Publication date
US7771813B2 (en) 2010-08-10
US20070098960A1 (en) 2007-05-03
JP2007528805A (en) 2007-10-18
CA2546728C (en) 2011-07-12
EP1691974A1 (en) 2006-08-23
CN1878663B (en) 2010-12-15
CA2546728A1 (en) 2005-06-23
AU2003303854A1 (en) 2005-06-29
CN1878663A (en) 2006-12-13

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